undef

s1a-ew-grd-hv-20150921t153058-20150921t153158-007815-00ae13-002_filter

s1a-ew-grd-hh-20150921t153058-20150921t153158-007815-00ae13-001_filter

s1a-ew-grd-hv-20150921t153058-20150921t153158-007815-00ae13-002_winddir

s1a-ew-grd-hh-20150921t153058-20150921t153158-007815-00ae13-001_winddir